What's the difference between river otters and sea otters?

What's the difference between river otters and sea otters?

River Otters vs Sea Otters - The Homeschool Scientist

River Otters vs Sea Otters - The Homeschool Scientist

Mink or otter? How to tell the difference - Discover Wildlife

Enhydra lutris: Sea Otter

Why is the Ocean Salty? - American Oceans

Did you know that river and sea otters are often mistaken for each oth, Sea Otters

Otters – Cowichan Estuary Nature Centre

Sea Otters Are the Party Animals of the Sea